Can't build Nutch 1.2

[Jeff Zhou]

Hi, I downloaded the official release of Nutch 1.2, and was trying to build
it when errors occured. I am using Windows 7 with Chinese enabled.

The errors down below basically says that the class file
(C:\nutch\lib\hadoop-0.20.2-core.jar(org/apache/hadoop
/conf/Configuration.class) has version of 50, which however should be 49.

How can I resolve this?

Thanks!


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Buildfile: C:\nutch\build.xml

init:
    [unjar] Expanding: C:\nutch\lib\hadoop-0.20.2-core.jar into
C:\nutch\build\h
adoop
    [unjar] Expanding: C:\nutch\lib\hadoop-0.20.2-tools.jar into
C:\nutch\build\
hadoop
    [untar] Expanding: C:\nutch\build\hadoop\bin.tgz into C:\nutch\bin
    [unjar] Expanding: C:\nutch\lib\hadoop-0.20.2-core.jar into
C:\nutch\build
    [unjar] Expanding: C:\nutch\lib\hadoop-0.20.2-tools.jar into
C:\nutch\build

compile-core:
    [javac] C:\nutch\build.xml:107: warning: 'includeantruntime' was not
set, de
faulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Compiling 241 source files to C:\nutch\build\classes
    [javac]
C:\nutch\src\java\org\apache\nutch\analysis\AnalyzerFactory.java:29:
 无法访问 org.apache.hadoop.conf.Configuration
    [javac] 错误的类文件： C:\nutch\lib\hadoop-0.20.2-core.jar(org/apache/hadoop
/conf/Configuration.class)
    [javac] 类文件具有错误的版本 50.0，应为 49.0
    [javac] 请删除该文件或确保该文件位于正确的类路径子目录中。
    [javac] import org.apache.hadoop.conf.Configuration;
    [javac]                               ^
    [javac] 1 错误